Cell phone sales for a Dubai-based firm over the last 9 weeks are shown in the following table. Week 1 2 3 Demand Week Demand Week Demand 685 4 710 7 760 690 5 725 8 780 700 6 740 9 800 a) Referring to the cell phone data, use the MA (3) and MA (3,2,4,6) to predict week 10 b) Referring to the cell phone data, use the exponential smoothing to obtain forecasts for week 10. Use a = 0.7/0.9 and F (1) = 675 d) c) Apply one of the error measures on (a) and (b) to select the most accurate forecasting technique. A dry cleaner uses exponential smoothing to forecast equipment usage at its main plant. August usage was forecasted to be 88 percent of capacity; actual usage was 89.6 percent of capacity. A smoothing constant of .1 is used. Prepare a forecast for September. Assuming actual September usage of 92 percent, prepare a forecast for October usage. F(t) = a* A(t-1) + (1- a) * F(t-1)